Norfolk Southern, CSX Struggle
With Ex-Conrail's Freight Delays

Trouble spots have broken out on the former Conrail Inc. rail system recently divided between Norfolk Southern Corp. and CSX Corp., causing freight tie-ups and service failures for railroad customers.

Norfolk Southern acknowledged that computer foul-ups have led to misrouted shipments and backups at major freight yards in the Northeast and Midwest. Industry officials said that in some cases, Norfolk Southern computers were...